钒页岩全湿法绿色提取技术

Green extraction technology of vanadium-bearing shale via whole hydrometallurgical process

我国页岩钒行业正面临技术转型与环境协调发展的双重挑战.本文系统研究了钒矿物晶格驰豫释钒行为及钒原子在矿物晶格和溶液环境中的配位转化规律,揭示了含钒矿物表面调整活化增溶、单金属协萃分离、氢还原无铵沉钒等核心机制,在总结多年工程转化经验的基础上,提出了新一代钒页岩全湿法绿色提取技术.结果表明:钒浸出率显著提升至90%以上,硫酸用量降低至180~240 kg/t矿石,钒产品纯度≥99.8%.研究成果解决了我国钒页岩的清洁生产关键问题,对当前行业低碳、清洁、高效生产主流发展和保障我国在这一领域的领先地位起到了积极作用.

At present,the shale-hosted vanadium industry is facing double challenges from technical transformation and harmonious development of environment.In the paper,the vanadium releasing behavior caused by minerals lattice relaxion and its species change from mineral lattice to aqueous solution were systematically studied while the core mechanisms on surface-adjusted activating solubilization of vanadium-bearing minerals,synergistic extraction of vanadium ions and its non-ammonia hydrogen reductive precipitation have been also revealed.Basing on years of engineered transformation experiences,the next-generation green whole-hydrometallurgical extraction technology of vanadium-bearing shale was proposed by the authors.The results show that the vanadium leaching efficiency achieves over 90%and the sulfuric acid consumption significantly reduces to 180-240 kg/t ore,as well as vanadium product purity of more than 99.8%.The research work can get about solving the key issues on clean production of vanadium-bearing shale and will benefit the mainstream development of low-carbon,clean and high-efficient production in vanadium industry and guarantee the leading position of China in this field.